Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS5508750 A
Publication typeGrant
Application numberUS 08/383,349
Publication date16 Apr 1996
Filing date3 Feb 1995
Priority date3 Feb 1995
Fee statusPaid
Publication number08383349, 383349, US 5508750 A, US 5508750A, US-A-5508750, US5508750 A, US5508750A
InventorsRobert J. Gove, Gregory J. Hewlett
Original AssigneeTexas Instruments Incorporated
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Encoding data converted from film format for progressive display
US 5508750 A
Abstract
A method of encoding video display data, after that data has been previously converted from a film frame rate to a faster video frame rate, such as by 3:2 pulldown. The data is first re-converted to the film frame format, as progressive frames (21). This progressive frame data is processed to determine where scene cuts occur (22). The data is then encoded consistent with MPEG encoding techniques, but with the scene cut information being used to begin groups of pictures (GOPs) at scene cuts and to determine where intrapictures, predicted pictures, or interpolated pictures shall occur (23).
Images(2)
Previous page
Next page
Claims(20)
What is claimed is:
1. A method of encoding video display data, after that data has been previously converted from a film frame rate to a faster video frame rate, comprising the steps of:
re-converting the data to the film frame rate, thereby obtaining progressive frame data;
detecting when scene cuts occur in said progressive frame data; and
encoding said progressive frame data, such that each scene cut begins a new group-of-pictures (GOP) and each new GOP has an intrapicture as the first picture.
2. The method of claim 1, wherein said video display data has been previously converted by repeating fields, and wherein said re-converting step is performed by detecting a pattern of repeated fields.
3. The method of claim 2, wherein said pattern of repeated fields are detected by calculating field difference values.
4. The method of claim 1, wherein said video display data has been previously converted using a 3:2 pulldown process, and wherein said re-converting step is performed by detecting the 3:2 pulldown pattern.
5. The method of claim 1, wherein said detecting step is performed by calculating frame difference values in said progressive frame data.
6. The method of claim 1, wherein said detecting step is further performed by analyzing a series of frame difference values to distinguish motion from scene cuts.
7. The method of claim 6, wherein said frame difference values are spatial domain values.
8. The method of claim 6, wherein said frame difference values are frequency domain values.
9. The method of claim 1, wherein said encoding step is performed such that the last picture of each GOP is either an intrapicture or an interpolated picture.
10. The method of claim 9, wherein said encoding steps is performed such that pictures within each GOP, except said first picture or said last picture, include interpolated pictures.
11. The method of claim 1, wherein said encoding step is performed in parallel for a number of GOPs.
12. A processor for encoding video display data, after that data has been previously converted from a film frame rate to a faster video frame rate, comprising:
a reverse pulldown processor for re-converting the data to the slower film frame rate, thereby obtaining progressive frame data;
a scene cut detector for detecting when scene cuts occur in said progressive frame data; and
an encoder for encoding said progressive frame data, such that each scene cut begins a new group-of-pictures (GOP) and each new GOP has an intrapicture as the first picture.
13. The method of claim 12, wherein said video display data has been previously converted by repeating fields, and wherein said reverse pulldown processor detects a pattern of repeated fields.
14. The method of claim 13, wherein said reverse pulldown processor calculates field difference values.
15. The method of claim 12, wherein said video display data has been previously converted using a 3:2 pulldown process, and wherein said reverse pulldown processor detects the 3:2 pulldown pattern.
16. The method of claim 12, wherein said scene cut detector calculates frame difference values in said progressive frame data.
17. The method of claim 12, wherein said scene cut detector analyzes a series of frame difference values to distinguish motion from scene cuts.
18. The method of claim 12, wherein said encoder encodes the last picture of each GOP as either an intrapicture or an interpolated picture.
19. The method of claim 18, wherein said encoder encodes pictures within each GOP, except said first picture or said last picture, as interpolated pictures.
20. The method of claim 12, wherein said processor has a number of encoders for encoding different scenes in parallel.
Description
BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a segment of a movie film being scanned for broadcast as an NTSC television signal, to create 3:2 pulldown data.

FIG. 2 illustrates a method of processing 3:2 pulldown data for MPEG encoding.

FIG. 3 illustrates a reverse 3:2 pulldown conversion in accordance with step 21 of FIG. 2.

FIG. 4 illustrates how MPEG pictures are arranged before and after a scene cut, prior to transmission.

FIG. 5 is a functional block diagram of a processor system, programmed in accordance with the invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 illustrates a segment of movie film being scanned for broadcast as an NTSC television signal. As indicated, the film displays 24 frames per second. Frame 1 has been scanned three times to make three fields of the television signal. Frame 2 has been scanned twice, Frame 3 three times, etc. The result is a television signal having 60 interlaced fields per second (30 frames per second), which approximates the 59.94 field per second rate of the standard NTSC format. This process is referred to as "3:2 pulldown scanning".

Although the above description is in terms of 3:2 pulldown scanning to an NTSC television signal, the same concepts apply to scanning movie films to other television formats. For example, for a PAL broadcast of 50 fields per second, a film-to-video ratio of 2 television fields per movie frame might be used. For this reason, the 3:2 pulldown format is referred to generally herein as a "film-to-video format", characterized by the fact that source image frames are scanned in a periodic sequence that results in a desired field-to-frame ratio.

In the 3:2 example of this description, the desired field-to-frame ratio is:

60/24=5/2.

For integer frame numbers, this is equivalent to five video fields for every two film frames, with the best symmetry being accomplished with 3:2 pulldown scanning.

The 24 frame per second film is progressive in the sense that each frame contains the entire number of lines for one picture. However, the 60 field per second video is interlaced. Half of each movie frame (the top or the bottom lines) is used for each video field. For purposes of this description, the "top" field is the field containing the first line and every alternating line of a frame, whereas the "bottom" field is the field containing the second line and every alternating line. This eliminates confusion with respect to whether line numbering begins at 0 or begins at 1. Assuming that the first line was line 0, the top field would be the even field.

In FIG. 1, for CRT-based display systems, the top fields (T1 . . . T4) are interlaced with the bottom fields (B1 . . . B4) when the data is scanned to the CRT screen. However, a recent development in image display systems are non-CRT display systems that use progressive frames rather than interlaced fields. One type of progressive display system is a spatial light modulator (SLM)-based system. A specific example of such an SLM is a digital micro-mirror device (DMD). DMD-based display systems are described in the several patents and patent applications, each assigned to Texas Instruments, and each incorporated by reference herein. These include U.S. Pat. No. 5,079,544, entitled "Standard Independent Digitized Video System", U.S. Pat. No. 08/147,249, entitled "Digital Television System", and U.S. Pat. No. 08/146,385, entitled "DMD Display System".

A feature of the invention is the recognition that video that has undergone 3:2 pulldown conversion can undergo an enhanced MPEG encoding process to improve picture quality. In FIG. 1, frames 1, 4, and 5 of the video signal contain data from the same movie frame. However, frames 2 and 3 contain data from time-separated movie frames. If a scene cut were to occur in either frame 2 or 3, the two fields in that frame would be entirely unrelated. The predictive coding of an MPEG-based encoding method would be frustrated. Upon decoding and display, the picture quality would not reflect the image quality that MPEG attempts to achieve.

FIG. 2 illustrates a process of encoding video data in accordance with the invention. The method is especially useful for encoding data for eventual decoding and display by a display system, such as a DMD-based system, that is capable of displaying progressive frames at 24 frames per second. However, the method could be used for any display system, with appropriate scan rate conversion of the data prior to display.

For purposes of this description, it is assumed that the input data is data that represents images originally produced on film at 24 frames per second. This input data has been converted to 30 frame per second format by means of 3:2 pulldown. If this data does not match the desired resolution or aspect ratio requirements, appropriate downscaling or upscaling may be performed.

In step 21, the data is converted from its 30 frame per second interlaced format to its original 24 frame per second progressive format. This is accomplished by determining, for each frame, whether the two fields of the frame are from time-separated movie frames. By identifying where top and bottom fields are repeated, the data can be converted from 30 frame per second video format to 24 frame per second progressive format.

FIG. 3 illustrates a "reverse 3:2 pulldown in accordance with step 21. Fields T1 and B1 are from the same movie frame. Field T1 is repeated and is not used a second time. Fields T2 and B2 are from a second movie frame. In this manner, the two fields that belong to the same frame of the 24 frame per second format are identified. These fields are then put together to form progressive frames.

In general, to identify the fields with the correct frames, the 3:2 pattern is identified by a field differencing process. The pixel values between successive B fields and successive T fields are compared. A high difference value indicates a change between fields. Where "1" indicates a high difference value above a specified threshold, the 3:2 pattern will be 0,1,1,1,1,0,1,1,1,1,0 . . . when there is motion. Once this pattern is identified, the fields associated with "0" field difference values are considered repeated fields. The two pairs of intervening fields belong to two movie frames.

U.S. Pat. No. 08/145,934, entitled "Film-to-Video Format Detection for Digital Television", describes further details of how a pattern of data that has been converted to 3:2 format can be detected. Each field can be associated with a position in the 3:2 pattern. The same techniques can be applied to the present invention to determine which fields are from the same frame. That patent application is assigned to Texas Instruments Incorporated and is incorporated herein by reference.

Referring again to FIG. 2, in step 22 of the encoding method of the invention, the data is now 24 frame per second progressive frame data. A scene cut detection process is applied to this data. This determines the best place for the beginning of each group-of-pictures (GOP).

In general, scene cut detection relies on detecting change in a sequence of frames. As in the case of motion detection, a pixel-to-pixel difference of two successive frames followed by a threshold operation yields a scene difference value. A large difference indicates that the scene has changed. Then, it must be determined whether the change is due to a scene cut or to other factors, such as motion within the image, camera panning, or a change in illumination.

In a first method of scene cut detection, a series of frame difference values are obtained. These are then analyzed over time, on the premise that motion will result in a relatively constant series of frame difference values, whereas a scene change will result in a single abrupt frame difference value.

In another method of scene cut detection, pixel values of each frame are transformed into frequency domain values. The frame difference values are then obtained and analyzed over time. As in the spatial domain method, motion will result in a relatively constant values over time. Frequency domain values, especially those values corresponding to low frequencies, will be less affected by motion than spatial domain values. Thus, the margin between frames with motion and frames with a scene cut is greater, and false scene cut detection is less likely. In a simple frequency domain method, a pixel average for each entire frame might be obtained, and the low frequency values compared from frame to frame.

Various scene cut detection methods are described in U.S. Pat. No. 5,099,322 to Gove, entitled "Scene Change Detection System and Method", assigned to Texas Instruments Incorporated and incorporated by reference herein. These methods suitable for use in the present invention.

The various scene-cut detection methods will correctly parse the data in most cases. In the case of camera panning, a high frame difference that is not a scene cut might exist. To distinguish panning scenes from scene cuts, a high pass filter may be used to eliminate as scene cuts, long runs of high variations. Another type of false identification of a scene cut might occur in the case of an explosion. However, such false identifications can be included as scene cuts without detriment to picture quality.

In step 23, the data is compressed, with a scene-cut control signal from step 22 being used to determine the encoding. The encoding step is consistent with MPEG standards, using groups of pictures (GOPs) with intrapictures, predicted pictures, and interpolated pictures.

However, in accordance with the invention, the scene cut control signal is used to ensure that after each scene-cut, a new GOP is begun. The beginning of each GOP is a random access point, which may be decoded without reference to any previously decoded pictures.

The scene-cut control signal also determines what type of MPEG pictures will be encoded within each GOP. The first frame after the scene-cut is a intrapicture (I) frame. Thus, no motion estimation is attempted over the scene-cut boundary. The last frame of the scene is a reference picture, which means that it must be either an I picture or a predicted (P) picture. Predicted pictures are coded with reference to a past picture (I or P) are used as a reference for future predicted pictures. The in between frames within the scene include bidirectional (B) pictures, which provide high compression but require both a past and a future reference picture for prediction. These in between pictures may also include I pictures and P pictures, especially if the scene is longer than a predetermined number of frames, typically 6-8 frames or 1/3 second.

FIG. 4 illustrates the sequence within each frame, of the first frame, last frame, and in between frames. As illustrated, the first picture is an intrapicture. The last picture is either an intrapicture or a predicted picture. The pictures in between are bidirectional pictures, but could also be intrapictures or predicted pictures. In the arrangement of FIG. 4, the pictures correspond to the order of the source data, but will be rearranged for transmission in accordance with MPEG standards.

Once the arrangement of pictures (I, B, or P) to be encoded is determined, the encoding is performed in accordance with MPEG techniques. These techniques are described in an article by Le Gall, "MPEG: A Video Compression Standard for Multimedia Applications", Communications of the ACM, April 1991, Vol. 34, No. 4, pp 47-58. The MPEG publication is ISO/IEC/13818-2, "Coding of Moving Pictures and Associated Audio".

FIG. 5 illustrates a processor system 50, programmed to encode 3:2 data in accordance with the invention. In FIG. 5, processor system 50 has a number of subprocessor systems 51, 53, 55. Apart from the memory components (field buffers 51a and frame buffers 53a), each subprocessor system 51, 53, 55 can be implemented entirely with software or may be implemented with equivalent logic circuitry for performing one or more tasks. For example, the reverse pulldown process could be entirely performed with programming executed by a processor, or as illustrated, could incorporated an adder and comparator. Furthermore, it is possible that all tasks other than those of the buffers 51a, 53a could be implemented with a single processor.

A reverse pulldown process 51 converts the data from film format to progressive format, consistent with step 21 of FIG. 2. Field buffers 51a store fields of data, whose pixel values are currently being compared. An adder 51b calculates pixel difference values and a field difference value, which is compared to a threshold by comparator 51c. The field difference values are analyzed by a field difference analyzer 51d to detect the pulldown pattern, such as the 3:2 pattern discussed above. It delivers a control signal to the field buffers 51a so that the proper fields may be retained and re-combined to make progressive frames.

A scene cut detection process 53 detects scene cuts in consistent with step 22 of FIG. 2. It includes frame buffers 53a, which receive and combine fields of data in the correct order from field buffers 51a as determined by the control signal from analyzer 51d. The data in frame buffers 51a may be output as progressive frames. An adder 53b determines frame difference values, which are compared to a threshold by a comparator 53c. The frame difference values are analyzed by a frame difference analyzer 53d to distinguish scene cuts from other scene changes, such as motion.

One or more encoders 55 encode the data consistent with step 23 of FIG. 2. An advantage of separating the data into scenes is that subsequent encoding can be performed in parallel. Each scene can be separately encoded, resulting in faster throughput. Thus, the scene cut control signal may be delivered to a multiplexer 54, which delivers parallel streams of data to different encoders 55.

As a result of the method described above, more bits are allowed per frame. A 1.5 Mbit per second rate for 30 frames per second allows an average of 50 kbits per frame. However, a 1.5 Mbit per second rate for 24 frames per second allows an average of 62.5 Kbits per frame.

Another result of the method is that bits are not wasted on high frequency quantization caused by time-separated fields. Fields sampled at different times result in serrated edges, which require higher bit rates to encode for a given quality level.

A third result of the method is that GOPs do not traverse scene-cuts. This improves computational performance during encoding. If the MPEG motion estimation function were performed across scene cuts, the worst case searches would occur.

A fourth result of the method is that the resulting MPEG bitstream is conveniently segmented by scene content. This benefits post-production processing, such as editing, random accessing by content, or assembling movie picture boards.

Other Embodiments

Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.

TECHNICAL FIELD OF THE INVENTION

This invention relates to image data processing, and more particularly to encoding data converted from film format, for a system that display progressively scanned frames of data, such as a spatial light modulator.

BACKGROUND OF THE INVENTION

It is often desired to display a movie originally recorded on film by means of a television broadcast. In order to comply with television broadcast field rates, some sort of film-to-video conversion must be performed.

Typically, a movie is recorded and displayed at a frame rate of 24 frames per second. However, television broadcasts use a different rate, such as the 59.94 field per second rate of the NTSC standard where every two fields are interlaced and comprise one frame.

One method of converting film frame rates to television field rates is referred to as the "3:2 pulldown" scanning method. A first film frame is scanned three times, then a second film frame is scanned twice, the next frame three times, etc. Every six film frames take the same time as fifteen fields of the television signal. To accommodate the fact that the NTSC vertical scan period is slightly less than 60 fields per second, fields may be dropped to match the actual rate of the receiver.

Film to video conversion is now being combined with techniques for digitizing the video data. These techniques include digital compression techniques for providing less bandwidth (bits per second). One compression technique is embodied in a standard known as "MPEG", named for the Moving Picture Experts Group that began the effort to provide a standard. The MPEG standard attempts to strike a balance between the high compression associated with interframe coding and the random access capability associated with intraframe coding. To answer this challenge, the MPEG standard uses two interframe coding techniques, predictive and interpolative, and an intracoded technique. For coding video data, the MPEG encoding techniques are used to encode MPEG "pictures" from fields or frames of video data.

SUMMARY OF THE INVENTION

One aspect of the invention is a method of processing and encoding video display data, after that data has been previously converted from a film frame rate to a faster video frame rate. A typical application of the method is for encoding data that has previously been converted from 24 frame per second film format to 30 frame per second video format. The data is first reconverted to the slower film frame rate, thereby obtaining progressive frame data. Then a scene cut detection process is applied to the progressive frame data to determine where scene cuts occur. The progressive frame data is then encoded consistent with MPEG encoding, but such that each scene cut begins a new group-of-pictures (GOP) and each new GOP has an intrapicture as the first picture. Also, the last picture of each GOP is either an intrapicture or a predicted picture. Intervening pictures can include intrapictures, predicted pictures, and interpolated pictures.

A technical advantage of the invention is that greatly improved picture quality of MPEG encoded data derived from film. Because the data is a 24 frames per second, rather than 30 frames per second, more bits are used per frame. Also, the method eliminates wasted bits due to high frequencies in frames with time-separated fields. Finally, scene division prevents spanning of scene cuts of GOPs, which results in meaningless motion vectors.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4982280 *18 Jul 19891 Jan 1991Yves C. FaroudjaMotion sequence pattern detector for video
US5099322 *27 Feb 199024 Mar 1992Texas Instruments IncorporatedScene change detection system and method
US5317398 *17 Aug 199231 May 1994Rca Thomson Licensing CorporationVideo/film-mode (3:2 pulldown) detector using patterns of two-field differences
US5406333 *14 Mar 199411 Apr 1995Thomson Consumer Electronics, Inc.Method and device for film-mode detection
US5457495 *25 May 199410 Oct 1995At&T Ipm Corp.Adaptive video coder with dynamic bit allocation
US5459517 *14 Dec 199317 Oct 1995Fuji Xerox Co., Ltd.Moving picture scene detection system
Non-Patent Citations
Reference
1 *Chad Fogg, MPEG 2 Technical Frequently Asked Questions (FAQ), May 10, 1994, 1 24.
2Chad Fogg, MPEG-2 Technical Frequently Asked Questions (FAQ), May 10, 1994, 1-24.
3 *Didier Le Gall, MPEG: A Video Compression Standard for Multimedia Applications, Communications of the ACM, Apr. 1991, vol. 34, No. 4, 47 58.
4Didier Le Gall, MPEG: A Video Compression Standard for Multimedia Applications, Communications of the ACM, Apr. 1991, vol. 34, No. 4, 47-58.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5729243 *21 Dec 199517 Mar 1998Philips Electronics North-America CorporationMulti-frame-rate operation of digital light-modulators
US5757435 *8 Dec 199526 May 1998C-Cube Microsystems, Inc.MPEG-2 inverse telecine circuit
US5767923 *7 Jun 199616 Jun 1998Electronic Data Systems CorporationMethod and system for detecting cuts in a video signal
US5778108 *7 Jun 19967 Jul 1998Electronic Data Systems CorporationMethod and system for detecting transitional markers such as uniform fields in a video signal
US5822024 *26 Feb 199713 Oct 1998Sony CorporationImage data processing method and apparatus of same
US5852473 *20 Feb 199622 Dec 1998Tektronix, Inc.3-2 pulldown detector
US5861924 *13 Mar 199719 Jan 1999Motorola, Inc.Methods and systems for processing video signal pixel data
US5864368 *26 Feb 199626 Jan 1999Sony CorporationPicture signal editing and encoding method and apparatus, signal recording medium and picture signal decoding method and apparatus
US5872564 *7 Aug 199616 Feb 1999Adobe Systems IncorporatedControlling time in digital compositions
US5920360 *7 Jun 19966 Jul 1999Electronic Data Systems CorporationMethod and system for detecting fade transitions in a video signal
US5925104 *16 Oct 199620 Jul 1999U.S. Philips CorporationMethod for making a multimedia application executable on hardware platforms with various different resource levels, a physical record containing such application, and an apparatus for executing such application
US5959697 *7 Jun 199628 Sep 1999Electronic Data Systems CorporationMethod and system for detecting dissolve transitions in a video signal
US6014182 *10 Oct 199711 Jan 2000Faroudja Laboratories, Inc.Film source video detection
US6058140 *8 Sep 19952 May 2000Nippon Steel CorporationMethod and apparatus for inverse 3:2 pulldown detection using motion estimation information
US6061471 *18 Dec 19979 May 2000Electronic Data Systems CorporationMethod and system for detecting uniform images in video signal
US6108041 *10 Oct 199722 Aug 2000Faroudja Laboratories, Inc.High-definition television signal processing for transmitting and receiving a television signal in a manner compatible with the present system
US6166447 *17 Sep 199726 Dec 2000Hyundai Electronics Industries Co., Ltd.Semiconductor memory device having first and second voltage level shifters
US620157716 Nov 199913 Mar 2001Faroudja Laboratories, Inc.Film source video detection
US630788620 Jan 199823 Oct 2001International Business Machines Corp.Dynamically determining group of picture size during encoding of video sequence
US6441813 *13 May 199827 Aug 2002Kabushiki Kaisha ToshibaComputer system, and video decoder used in the system
US6563550 *6 Mar 200013 May 2003Teranex, Inc.Detection of progressive frames in a video field sequence
US65804639 Feb 200117 Jun 2003Faroudja Laboratories, Inc.Film source video detection
US6597737 *1 Sep 199922 Jul 2003Sony CorporationMotion determining apparatus, method thereof, and picture information converting apparatus
US673168427 Aug 19994 May 2004General Instrument CorporationMethod and apparatus for detecting scene changes and adjusting picture coding type in a high definition television encoder
US6766098 *30 Dec 199920 Jul 2004Koninklijke Philip Electronics N.V.Method and apparatus for detecting fast motion scenes
US683909414 Dec 20004 Jan 2005Rgb Systems, Inc.Method and apparatus for eliminating motion artifacts from video
US685923714 Mar 200322 Feb 2005Genesis Microchip Inc.Film source video detection
US6870568 *2 Dec 199822 Mar 2005Stmicroelectronics Asia Pacific Pte Ltd.Progressive/interlace and redundant field detection for encoder
US6906687 *31 Jul 200114 Jun 2005Texas Instruments IncorporatedDigital formatter for 3-dimensional display applications
US7042525 *6 Jul 20009 May 2006Matsushita Electric Industrial Co., Ltd.Video indexing and image retrieval system
US752222129 Nov 200421 Apr 2009Genesis Microchip Inc.Interlaced video field motion detection
US755115415 Sep 200523 Jun 2009Hewlett-Packard Development Company, L.P.Image display system and method
US7623576 *26 Feb 199924 Nov 2009Stmicroelectronics Asia Pacific Pte. Ltd.Method and apparatus for interlaced/non-interlaced frame determination, repeat-field identification and scene-change detection
US773803729 Oct 200415 Jun 2010Rgb Systems, Inc.Method and apparatus for eliminating motion artifacts from video
US803126520 Aug 20074 Oct 2011Texas Instruments IncorporatedSystem and method for combining interlaced video frames
US81207101 Dec 200821 Feb 2012Tamiras Per Pte. Ltd., LlcInterlaced video field motion detection
US826989531 Oct 200718 Sep 2012Shenzhen Tcl New Technology LtdRecursive noise reduction system and method for film-based video
US20090154816 *17 Dec 200718 Jun 2009Qualcomm IncorporatedAdaptive group of pictures (agop) structure determination
EP0821531A2 *12 Jul 199728 Jan 1998Deutsche Thomson-Brandt GmbhEncoding and decoding of trick films
EP0831650A2 *14 Jun 199725 Mar 1998Deutsche Thomson-Brandt GmbhDigital image coding method and apparatus with scene changing detection
EP2106131A2 *3 Mar 200930 Sep 2009Kabushiki Kaisha ToshibaProgressive scan conversion device and method for performing progressive scan conversion
EP2109320A2 *31 Mar 200914 Oct 2009Sony CorporationInformation processing apparatus and information processing method
EP2112663A2 *31 Mar 200928 Oct 2009Sony CorporationInformation processing apparatus and information processing method
WO2000019726A1 *27 Aug 19996 Apr 2000Gen Instrument CorpMethod and apparatus for detecting scene changes and adjusting picture coding type in a high definition television encoder
WO2009051601A1 *31 Oct 200723 Apr 2009Shenzhen Tcl New TechnologyRecursive noise reduction system and method for film-based video
Classifications
U.S. Classification348/558, 348/E05.067, 375/E07.191, 375/E07.189, 375/E07.129, G9B/27.01, 375/E07.192, 348/E07.015, 375/E07.183, 348/700, 348/E05.142
International ClassificationG11B27/031, H04N5/14, H04N7/01, H04N5/44, H04N5/74, H04N7/26, G06T9/00
Cooperative ClassificationH04N19/00163, H04N19/00545, H04N19/0029, H04N19/00903, H04N5/7458, H04N19/00921, H04N5/147, G11B27/031, H04N7/012, H04N7/0112
European ClassificationH04N7/01G3, H04N7/26A6C6, H04N5/14S, H04N7/26A8S, G11B27/031, H04N7/26P8, H04N7/01F, H04N5/74M6, H04N7/26A10S, H04N7/26P, H04N7/26P6
Legal Events
DateCodeEventDescription
14 Sep 2007FPAYFee payment
Year of fee payment: 12
26 Sep 2003FPAYFee payment
Year of fee payment: 8
24 Sep 1999FPAYFee payment
Year of fee payment: 4
12 Jun 1995ASAssignment
Owner name: TEXAS INSTRUMENTS INCORPORATED, TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GOVE, ROBERT J.;REEL/FRAME:007827/0618
Effective date: 19950521
3 Feb 1995ASAssignment
Owner name: TEXAS INSTRUMENTS INCORPORATED, TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HEWLETT, GREGORY J.;GOVE, ROBERT J.;REEL/FRAME:007477/0800
Effective date: 19950202